Emerging evidence suggests that younger maternal age may increase the rate of stroke within 6 weeks...

Emerging evidence suggests that younger maternal age may increase the rate of stroke within 6 weeks of delivery. Let’s use the following HYPOTHETICAL dataset to explore this association (Table 1). Women were classified as aged 16-19 years, 20-34 or 35-44 at the time of delivery. Within each maternal age category, person-time accrued until a woman either had a stroke within 6 weeks of delivery, was lost to follow-up or died of other causes, or was no longer at risk (beyond 6 weeks post-delivery).

Table 1: Association between maternal age and stroke within 6 weeks of delivery

	Aged 16-19	Aged 20-34	Aged 35-44	Total
Stroke	23	281	45	349
No Stroke	229,692	3,097,513	539,844	3,867,049
Total Person-Weeks	1,378,159	18,585,546	3,239,006	23,202,711

a. Calculate the incidence rate ratio for the association between maternal age 16-19, relative to maternal age 35-44, and stroke within 6 weeks of delivery. Round to two decimal places. (3 points)

b. Calculate the excess incidence rate ratio for the association between maternal age 20-34, relative to maternal age 35-44, and stroke within 6 weeks of delivery. Round to two decimal places. (3.5 points)

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orchestra answered 3 years ago

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Emerging evidence suggests that younger maternal age may increase the rate of stroke within 6 weeks...

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